Hach DR/700 - Page 71

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Table 9 Required Containers, Preservation Techniques and
Holding Times
1
(continued)
Maximum
Parameter No./Name Container
2
Preservation
3,4
Holding Time
5
Metals (continued):
35. Mercury P, G HNO
3
to pH < 2 28 days.
3, 5-8, 10, 12, 13, 19, 20, P, G do 6 months.
22, 26, 29, 30, 32-34, 36,
37, 45, 47, 51, 52, 58-60,
62, 63, 70-72, 74, 75.
Metals, except chromium
VI and mercury.
38. Nitrate P, G Cool, 4 °C 48 hours.
39. Nitrate-nitrite
5
P, G Cool, 4 °C, H
2
SO
4
28 days.
to pH < 2
40. Nitrite P, G Cool, 4 °C 48 hours.
41. Oil and grease G Cool, 4 °C, H
2
SO
4
28 days.
to pH < 2
42. Organic carbon P, G Cool, 4 °C, HCl or do.
H
2
SO
4
to pH < 2
44. Orthophosphate P, G Filter immediately, 48 hours.
Cool, 4 °C
46. Oxygen, G Bottle None required Analyze
Dissolved Probe and top immediately.
47. Winkler do Fix on site and 8 hours.
store in dark
48. Phenols G only Cool, 4 °C, H
2
SO
4
28 days.
to pH < 2
49. Phosphorus (elemental) G Cool, 4 °C 48 hours.
50. Phosphorus, total P, G Cool, 4 °C, H
2
SO
4
28 days.
to pH < 2
53. Residue, total P, G Cool, 4 °C 7 days.
54. Residue, Filterable P, G do 7 days.
55. Residue,
Nonfilterable (TSS) P, G do 7 days.
56. Residue, Settleable P, G do 48 hours.
57. Residue, volatile P, G do 7 days.